684000domain: NAppears in sequencesNumbers n such that 2*n and n^3 have the same digit sum.at n=35A266315Expansion of e.g.f. exp(Sum_{k=1..4} (exp(k*x) - 1)).at n=5A355422Square array T(n,k), n >= 0, k >= 0, read by antidiagonals, where column k is the expansion of e.g.f. exp(Sum_{j=1..k} (exp(j*x) - 1)).at n=50A355423